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SCSI Start Unit Failure

By grez_dego ·
I have an Adaptec P6BDU (?) motherboard with an onboard SCSI Adapter. The primary IDE is a CDROM, the Primary SCSI is an IBM DMVS Ultra2-LVD HDD, and the secondary SCSI is an HP tape drive. I don't know the SCSI model #, but the boot sequence looks like this:

At power-up, several system beeps and PC must be reset

ADAPTEC AIC-7890 SCSI BIOS v.2.01
SCSI ID:0 IBM DMVS - START UNIT REQUEST FAIL
SCSI ID:5 HP C1537A FAST/ULTRA-SE
SCSI BIOS NOT INSTALLED!

Of course there are time breaksin between each line as the failures are reported to the BIOS, but that's the idea. So I have a couple problems here:

1 - Start unit req failed? Adaptec told me to go into the adapter settings and turn the "Send Start Unit Command" off, but that creates a hang and reboot situation.

2 - Is the HP C1537A Fast/Ultra SE correct? It's an HP Tape Drive.

3 - SEVERAL system beeps.

I shouldn't have to worry about IRQs because this is ON-BOARD, but I stripped all the add-ons anyway. Finaldetails: PIII-500, 256k RAM, Windows 9x Platform, IDE is detected fine.

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SCSI Start Unit Failure

by ins413 In reply to SCSI Start Unit Failure

Frist step is to check all jumper settings both on board on on the devices. Make sure you have proper termniation on both ends of the bus. The soft settings may be right on the board, but you will get a error if the settings do not correspond in the devices. The detection sounds fine. One word of caution though, scsi devices are extermely sensitive to static. I have ruined a few and take my word for it, it is very possible for it to happen. Hope this helps.

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SCSI Start Unit Failure

by grez_dego In reply to SCSI Start Unit Failure

Oddly enougn, it had been operating wihtout any jumpers at all!

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SCSI Start Unit Failure

by allan In reply to SCSI Start Unit Failure

Check the 'auto start' jumpers... here is IBM's stuff for your drive :-
Auto Start and Delay pins

The Auto Start and Auto Start Delay pins control when and how the drive can spin up and come ready. When configured for Auto Start, the motor spins up after power is applied without the need for a SCSI Start Unit command. The drive will delay its start time by a period multiplied by its own SCSI address. When the drive is not configured for Auto-Startup, a SCSI Start Unit command is required to make the drive spin and be ready for media access operations.

Follow this link for detail :
http://www.storage.ibm.com/techsup/hddtech/dmvs/dmvsjum.htm

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SCSI Start Unit Failure

by grez_dego In reply to SCSI Start Unit Failure

Same as above! Sorry.

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SCSI Start Unit Failure

by grez_dego In reply to SCSI Start Unit Failure

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